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| author | David Howells <dhowells@redhat.com> | 2020-10-21 15:22:19 +0300 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2020-10-29 16:53:04 +0300 |
| commit | fa04a40b169fcee615afbae97f71a09332993f64 (patch) | |
| tree | 3a6123e3b15b9881cd1227f5c129d5e3f8c36732 /fs/afs/file.c | |
| parent | d383e346f97d6bb0d654bb3d63c44ab106d92d29 (diff) | |
| download | linux-fa04a40b169fcee615afbae97f71a09332993f64.tar.xz | |
afs: Fix to take ref on page when PG_private is set
Fix afs to take a ref on a page when it sets PG_private on it and to drop
the ref when removing the flag.
Note that in afs_write_begin(), a lot of the time, PG_private is already
set on a page to which we're going to add some data. In such a case, we
leave the bit set and mustn't increment the page count.
As suggested by Matthew Wilcox, use attach/detach_page_private() where
possible.
Fixes: 31143d5d515e ("AFS: implement basic file write support")
Reported-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Diffstat (limited to 'fs/afs/file.c')
| -rw-r--r-- | fs/afs/file.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/fs/afs/file.c b/fs/afs/file.c index 91225421ad37..322973d12614 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -627,11 +627,9 @@ static void afs_invalidatepage(struct page *page, unsigned int offset, #endif if (PagePrivate(page)) { - priv = page_private(page); + priv = (unsigned long)detach_page_private(page); trace_afs_page_dirty(vnode, tracepoint_string("inval"), page->index, priv); - set_page_private(page, 0); - ClearPagePrivate(page); } } @@ -661,11 +659,9 @@ static int afs_releasepage(struct page *page, gfp_t gfp_flags) #endif if (PagePrivate(page)) { - priv = page_private(page); + priv = (unsigned long)detach_page_private(page); trace_afs_page_dirty(vnode, tracepoint_string("rel"), page->index, priv); - set_page_private(page, 0); - ClearPagePrivate(page); } /* indicate that the page can be released */ |